In Norway, 1mm or more is considered a positive test, however, there are A LOT false positives as well as false negative results. Stress EKG
is not a very reliable test
It also depends when during the test
you had the ST segment depression. Anxiety and nervousness can cause ST segment changes at lower heart rates which disappear at higher heart rates. I remember my EKG during a panic attack showing 1,3 mm ST depression, heart rate 130.